今天使用oracle数据库的使用发现有句SQL语句居然无法执行，提示标识符错误。
网上查询资料发现居然是和数据库关键字“comment” 重复了。
http://zhidao.baidu.com/question/147093857.html
数据库一般关键字：
ACCESS ADD ALL ALTER AND ANY AS ASC AUDIT BETWEEN BY CHAR CHECK CLUSTER COLUMN COMMENT COMPRESS CONNECT CREATE CURRENT DATE DECIMAL DEFAULT DELETE DESC DISTINCT DROP ELSE EXCLUSIVE EXISTS FILE FLOAT FOR FROM GRANT GROUP HAVING IDENTIFIED IMMEDIATE IN INCREMENT INDEX INITIAL INSERT INTEGER INTERSECT INTO IS LEVEL LIKE LOCK LONG MAXEXTENTS MINUS MLSLABEL MODE MODIFY NOAUDIT NOCOMPRESS NOT NOWAIT NULL NUMBER OF OFFLINE ON ONLINE OPTION OR ORDER P CTFREE PRIOR PRIVILEGES PUBLIC RAW RENAME RESOURCE REVOKE ROW ROWID ROWNUM ROWS SELECT SESSION SET SHARE SIZE SMALLINT START SUCCESSFUL SYNONYM SYSDATE TABLE THEN TO TRIGGER UID UNION UNIQUE UPDATE USER VALIDATE VALUES VARCHAR VARCHAR2 VIEW WHENEVER WHERE WITH
